The lightning almost snatcheth away their sight from them . As often as it flasheth forth for them they walk therein , and when it darkeneth against them they stand still . If Allah willed , He could destroy their hearing and their sight Lo! Allah is Able to do all things . {Surah - Baqara, Verse 20}

The Prophet (Sal-allahu-aleihi-wasallam) said, "If anyone recites surat al-Kahf on Friday, a light will shine brightly for him till the next Friday."